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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_COMPOSITOR_LAYER_ANIMATION_ELEMENT_H_
#define UI_GFX_COMPOSITOR_LAYER_ANIMATION_ELEMENT_H_
#pragma once
#include <set>
#include "base/time.h"
#include "ui/gfx/compositor/compositor_export.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/transform.h"
namespace ui {
class LayerAnimationDelegate;
class Transform;
// LayerAnimationElements represent one segment of an animation between two
// keyframes. They know how to update a LayerAnimationDelegate given a value
// between 0 and 1 (0 for initial, and 1 for final).
class COMPOSITOR_EXPORT LayerAnimationElement {
public:
enum AnimatableProperty {
TRANSFORM = 0,
BOUNDS,
OPACITY
};
struct TargetValue {
TargetValue();
// Initializes the target value to match the delegate. NULL may be supplied.
explicit TargetValue(const LayerAnimationDelegate* delegate);
gfx::Rect bounds;
Transform transform;
float opacity;
};
typedef std::set<AnimatableProperty> AnimatableProperties;
LayerAnimationElement(const AnimatableProperties& properties,
base::TimeDelta duration);
virtual ~LayerAnimationElement();
// Creates an element that transitions to the given transform. The caller owns
// the return value.
static LayerAnimationElement* CreateTransformElement(
const Transform& transform,
base::TimeDelta duration);
// Creates an element that transitions to the given bounds. The caller owns
// the return value.
static LayerAnimationElement* CreateBoundsElement(
const gfx::Rect& bounds,
base::TimeDelta duration);
// Creates an element that transitions to the given opacity. The caller owns
// the return value.
static LayerAnimationElement* CreateOpacityElement(
float opacity,
base::TimeDelta duration);
// Creates an element that pauses the given properties. The caller owns the
// return value.
static LayerAnimationElement* CreatePauseElement(
const AnimatableProperties& properties,
base::TimeDelta duration);
// Updates the delegate to the appropriate value for |t|, which is in the
// range [0, 1] (0 for initial, and 1 for final). If the animation is not
// aborted, it is guaranteed that Progress will eventually be called with
// t = 1.0.
void Progress(double t, LayerAnimationDelegate* delegate);
// Called if the animation is not allowed to complete. This may be called
// before OnStarted or Progress.
void Abort();
// Assigns the target value to |target|.
void GetTargetValue(TargetValue* target) const;
// The properties that the element modifies.
const AnimatableProperties& properties() const { return properties_; }
// The duration of the animation
base::TimeDelta duration() const { return duration_; }
protected:
// Called once each time the animation element is run before any call to
// OnProgress.
virtual void OnStart(LayerAnimationDelegate* delegate) = 0;
virtual void OnProgress(double t, LayerAnimationDelegate* delegate) = 0;
virtual void OnGetTarget(TargetValue* target) const = 0;
virtual void OnAbort() = 0;
private:
bool first_frame_;
const AnimatableProperties properties_;
const base::TimeDelta duration_;
DISALLOW_COPY_AND_ASSIGN(LayerAnimationElement);
};
} // namespace ui
#endif // UI_GFX_COMPOSITOR_LAYER_ANIMATION_ELEMENT_H_
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